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T: Fachverband Teilchenphysik
T 13: Flavorphysik (Theorie) I
T 13.8: Vortrag
Mittwoch, 5. März 2008, 18:30–18:45, KGI-HS 1132
Evaluation of charm quark dependent matrix elements of the B → Xs γ decay rate at NNLO — Michal Czakon, Radja Boughezal, and •Thomas Schutzmeier — Institut für Theoretische Physik und Astrophysik, Universität Würzburg
Since recently, theoretical predictions of the B → Xsγ decay mode in the standard model include various QCD effects up to the next-to-next-to-leading order (NNLO). At this level, however, contributions from charm-quark mass dependent matrix elements are crucial and still not fully evaluated.
The purpose of this talk is to present the current status of two approaches of different complexity that we apply to obtain the missing pieces and resolve or at least strongly reduce the ambiguity in the NNLO estimate.